code: def test_has_duplicates(self):
      idx = CategoricalIndex([0, 0, 0], name="foo")
      assert idx.is_unique is False
      assert idx.has_duplicates is True
  
      idx = CategoricalIndex([0, 1], categories=[2, 3], name="foo")
      assert idx.is_unique is False
      assert idx.has_duplicates is True
  
      idx = CategoricalIndex(
          [0, 1, 2, 3], categories=[1, 2, 3], name="foo"
      )
      assert idx.is_unique is True
      assert idx.has_duplicates is False
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas._libs import index
  from pandas._libs.arrays import NDArrayBacked
  import pandas
  from pandas import Categorical, CategoricalDtype
  import pandas._testing
  from pandas.core.indexes.api import CategoricalIndex, Index
label_desc: Use image node_id 7 for calling the TestCategoricalIndex obj's underlying member method code with example usage: obj.test_has_duplicates() without return types